Crystal structure of volatile pyridine adducts of trimethylplatinum(IV) β-diketonates

The structures of volatile pyridine adducts of trimethylplatinum(IV) β-diketonates derived from acetylacetone (Hacac) and dipivaloylmethane (Hdpm) are studied for the first time. Their preparation is reported and the data of thermal studies obtained by the DTA technique are presented. The structures of the compounds in question comprise monomeric complexes. The platinum atom is coordinated to three carbon atoms of methyl groups, two oxygen atoms of β-diketone, and the nitrogen atom of the pyridine molecule. The (PtC₃O₂N) coordination core has the shape of a slightly distorted octahedron. The geometrical characteristics of the coordination cores are the following: in all complexes, the values of Pt-O, Pt-C_Me, Pt-N bond lengths and O-Pt-O chelate angles fall within 2.122–2.146 Å, 1.986–2.079 Å, 2.131–2.186 Å and 89.3–90.6° respectively.     

Some capabilities of microwave remote sensing of the atmosphere from drifting vehicles

We study the physical conditions for balloon-borne radiometric sounding of the humidity height profile in the 3-mm atmospheric transparency window, an unusual spectral band for such problems, using a balloon drifting in the tropopause. We solve the inverse problem and discuss the accuracy of reconstruction of the humidity profiles. Radiophysical Research Institute, Nizhny Novgorod, Russia. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 43, No. 3, pp. 207–216, March 2000     

Molecular structure of 2,9-dioxo-1,3,8,10-tetraoxa-2,9-dithiacyclotetradeca-5,12-diyne

Conclusions The heterocycle 2,9-dioxo-1,3,8,10-tetraoxa-2,9-dithiacyclotetradeca-5,12-diyne has a conformation of C₂ symmetry in the crystal; the acetylene fragments intersect at an angle of 20.8°. The bond lengths and the endocyclic valence angles are close to their standard values.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 12, pp. 2750–2753, December, 1987.     

Potential of deep-underwater neutrino telescopes for recording muons from charm decay

Within several models of charm production in hadron-nucleus interactions, it is shown that prompt-muon fluxes at the depths of operating and designed neutrino telescopes (1–4 km) can in principle be measured in experiments with a high detection threshold.